<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="Asciidoctor 2.0.26">
<title>Basic DataTemplate Sample</title>
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700">
<style>
/*! Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
/* Uncomment the following line when using as a custom stylesheet */
/* @import "https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700"; */
html{font-family:sans-serif;-webkit-text-size-adjust:100%}
a{background:none}
a:focus{outline:thin dotted}
a:active,a:hover{outline:0}
h1{font-size:2em;margin:.67em 0}
b,strong{font-weight:bold}
abbr{font-size:.9em}
abbr[title]{cursor:help;border-bottom:1px dotted #dddddf;text-decoration:none}
dfn{font-style:italic}
hr{height:0}
mark{background:#ff0;color:#000}
code,kbd,pre,samp{font-family:monospace;font-size:1em}
pre{white-space:pre-wrap}
q{quotes:"\201C" "\201D" "\2018" "\2019"}
small{font-size:80%}
sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}
sup{top:-.5em}
sub{bottom:-.25em}
img{border:0}
svg:not(:root){overflow:hidden}
figure{margin:0}
audio,video{display:inline-block}
audio:not([controls]){display:none;height:0}
fieldset{border:1px solid silver;margin:0 2px;padding:.35em .625em .75em}
legend{border:0;padding:0}
button,input,select,textarea{font-family:inherit;font-size:100%;margin:0}
button,input{line-height:normal}
button,select{text-transform:none}
button,html input[type=button],input[type=reset],input[type=submit]{-webkit-appearance:button;cursor:pointer}
button[disabled],html input[disabled]{cursor:default}
input[type=checkbox],input[type=radio]{padding:0}
button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}
textarea{overflow:auto;vertical-align:top}
table{border-collapse:collapse;border-spacing:0}
*,::before,::after{box-sizing:border-box}
html,body{font-size:100%}
body{background:#fff;color:rgba(0,0,0,.8);padding:0;margin:0;font-family:"Noto Serif","DejaVu Serif",serif;line-height:1;position:relative;cursor:auto;-moz-tab-size:4;-o-tab-size:4;tab-size:4;word-wrap:anywhere;-moz-osx-font-smoothing:grayscale;-webkit-font-smoothing:antialiased}
a:hover{cursor:pointer}
img,object,embed{max-width:100%;height:auto}
object,embed{height:100%}
img{-ms-interpolation-mode:bicubic}
.left{float:left!important}
.right{float:right!important}
.text-left{text-align:left!important}
.text-right{text-align:right!important}
.text-center{text-align:center!important}
.text-justify{text-align:justify!important}
.hide{display:none}
img,object,svg{display:inline-block;vertical-align:middle}
textarea{height:auto;min-height:50px}
select{width:100%}
.subheader,.admonitionblock td.content>.title,.audioblock>.title,.exampleblock>.title,.imageblock>.title,.listingblock>.title,.literalblock>.title,.stemblock>.title,.openblock>.title,.paragraph>.title,.quoteblock>.title,table.tableblock>.title,.verseblock>.title,.videoblock>.title,.dlist>.title,.olist>.title,.ulist>.title,.qlist>.title,.hdlist>.title{line-height:1.45;color:#7a2518;font-weight:400;margin-top:0;margin-bottom:.25em}
div,dl,dt,dd,ul,ol,li,h1,h2,h3,#toctitle,.sidebarblock>.content>.title,h4,h5,h6,pre,form,p,blockquote,th,td{margin:0;padding:0}
a{color:#2156a5;text-decoration:underline;line-height:inherit}
a:hover,a:focus{color:#1d4b8f}
a img{border:0}
p{line-height:1.6;margin-bottom:1.25em;text-rendering:optimizeLegibility}
p aside{font-size:.875em;line-height:1.35;font-style:italic}
h1,h2,h3,#toctitle,.sidebarblock>.content>.title,h4,h5,h6{font-family:"Open Sans","DejaVu Sans",sans-serif;font-weight:300;font-style:normal;color:#ba3925;text-rendering:optimizeLegibility;margin-top:1em;margin-bottom:.5em;line-height:1.0125em}
h1 small,h2 small,h3 small,#toctitle small,.sidebarblock>.content>.title small,h4 small,h5 small,h6 small{font-size:60%;color:#e99b8f;line-height:0}
h1{font-size:2.125em}
h2{font-size:1.6875em}
h3,#toctitle,.sidebarblock>.content>.title{font-size:1.375em}
h4,h5{font-size:1.125em}
h6{font-size:1em}
hr{border:solid #dddddf;border-width:1px 0 0;clear:both;margin:1.25em 0 1.1875em}
em,i{font-style:italic;line-height:inherit}
strong,b{font-weight:bold;line-height:inherit}
small{font-size:60%;line-height:inherit}
code{font-family:"Droid Sans Mono","DejaVu Sans Mono",monospace;font-weight:400;color:rgba(0,0,0,.9)}
ul,ol,dl{line-height:1.6;margin-bottom:1.25em;list-style-position:outside;font-family:inherit}
ul,ol{margin-left:1.5em}
ul li ul,ul li ol{margin-left:1.25em;margin-bottom:0}
ul.circle{list-style-type:circle}
ul.disc{list-style-type:disc}
ul.square{list-style-type:square}
ul.circle ul:not([class]),ul.disc ul:not([class]),ul.square ul:not([class]){list-style:inherit}
ol li ul,ol li ol{margin-left:1.25em;margin-bottom:0}
dl dt{margin-bottom:.3125em;font-weight:bold}
dl dd{margin-bottom:1.25em}
blockquote{margin:0 0 1.25em;padding:.5625em 1.25em 0 1.1875em;border-left:1px solid #ddd}
blockquote,blockquote p{line-height:1.6;color:rgba(0,0,0,.85)}
@media screen and (min-width:768px){h1,h2,h3,#toctitle,.sidebarblock>.content>.title,h4,h5,h6{line-height:1.2}
h1{font-size:2.75em}
h2{font-size:2.3125em}
h3,#toctitle,.sidebarblock>.content>.title{font-size:1.6875em}
h4{font-size:1.4375em}}
table{background:#fff;margin-bottom:1.25em;border:1px solid #dedede;word-wrap:normal}
table thead,table tfoot{background:#f7f8f7}
table thead tr th,table thead tr td,table tfoot tr th,table tfoot tr td{padding:.5em .625em .625em;font-size:inherit;color:rgba(0,0,0,.8);text-align:left}
table tr th,table tr td{padding:.5625em .625em;font-size:inherit;color:rgba(0,0,0,.8)}
table tr.even,table tr.alt{background:#f8f8f7}
table thead tr th,table tfoot tr th,table tbody tr td,table tr td,table tfoot tr td{line-height:1.6}
h1,h2,h3,#toctitle,.sidebarblock>.content>.title,h4,h5,h6{line-height:1.2;word-spacing:-.05em}
h1 strong,h2 strong,h3 strong,#toctitle strong,.sidebarblock>.content>.title strong,h4 strong,h5 strong,h6 strong{font-weight:400}
.center{margin-left:auto;margin-right:auto}
.stretch{width:100%}
.clearfix::before,.clearfix::after,.float-group::before,.float-group::after{content:" ";display:table}
.clearfix::after,.float-group::after{clear:both}
:not(pre).nobreak{word-wrap:normal}
:not(pre).nowrap{white-space:nowrap}
:not(pre).pre-wrap{white-space:pre-wrap}
:not(pre):not([class^=L])>code{font-size:.9375em;font-style:normal!important;letter-spacing:0;padding:.1em .5ex;word-spacing:-.15em;background:#f7f7f8;border-radius:4px;line-height:1.45;text-rendering:optimizeSpeed}
pre{color:rgba(0,0,0,.9);font-family:"Droid Sans Mono","DejaVu Sans Mono",monospace;line-height:1.45;text-rendering:optimizeSpeed}
pre code,pre pre{color:inherit;font-size:inherit;line-height:inherit}
pre.nowrap,pre.nowrap pre{white-space:pre;word-wrap:normal}
em em{font-style:normal}
strong strong{font-weight:400}
.keyseq{color:rgba(51,51,51,.8)}
kbd{font-family:"Droid Sans Mono","DejaVu Sans Mono",monospace;display:inline-block;color:rgba(0,0,0,.8);font-size:.65em;line-height:1.45;background:#f7f7f7;border:1px solid #ccc;border-radius:3px;box-shadow:0 1px 0 rgba(0,0,0,.2),inset 0 0 0 .1em #fff;margin:0 .15em;padding:.2em .5em;vertical-align:middle;position:relative;top:-.1em;white-space:nowrap}
.keyseq kbd:first-child{margin-left:0}
.keyseq kbd:last-child{margin-right:0}
.menuseq,.menuref{color:#000}
.menuseq b:not(.caret),.menuref{font-weight:inherit}
.menuseq{word-spacing:-.02em}
.menuseq b.caret{font-size:1.25em;line-height:.8}
.menuseq i.caret{font-weight:bold;text-align:center;width:.45em}
b.button::before,b.button::after{position:relative;top:-1px;font-weight:400}
b.button::before{content:"[";padding:0 3px 0 2px}
b.button::after{content:"]";padding:0 2px 0 3px}
p a>code:hover{color:rgba(0,0,0,.9)}
#header,#content,#footnotes,#footer{width:100%;margin:0 auto;max-width:62.5em;*zoom:1;position:relative;padding-left:.9375em;padding-right:.9375em}
#header::before,#header::after,#content::before,#content::after,#footnotes::before,#footnotes::after,#footer::before,#footer::after{content:" ";display:table}
#header::after,#content::after,#footnotes::after,#footer::after{clear:both}
#content{margin-top:1.25em}
#content::before{content:none}
#header>h1:first-child{color:rgba(0,0,0,.85);margin-top:2.25rem;margin-bottom:0}
#header>h1:first-child+#toc{margin-top:8px;border-top:1px solid #dddddf}
#header>h1:only-child{border-bottom:1px solid #dddddf;padding-bottom:8px}
#header .details{border-bottom:1px solid #dddddf;line-height:1.45;padding-top:.25em;padding-bottom:.25em;padding-left:.25em;color:rgba(0,0,0,.6);display:flex;flex-flow:row wrap}
#header .details span:first-child{margin-left:-.125em}
#header .details span.email a{color:rgba(0,0,0,.85)}
#header .details br{display:none}
#header .details br+span::before{content:"\00a0\2013\00a0"}
#header .details br+span.author::before{content:"\00a0\22c5\00a0";color:rgba(0,0,0,.85)}
#header .details br+span#revremark::before{content:"\00a0|\00a0"}
#header #revnumber{text-transform:capitalize}
#header #revnumber::after{content:"\00a0"}
#content>h1:first-child:not([class]){color:rgba(0,0,0,.85);border-bottom:1px solid #dddddf;padding-bottom:8px;margin-top:0;padding-top:1rem;margin-bottom:1.25rem}
#toc{border-bottom:1px solid #e7e7e9;padding-bottom:.5em}
#toc>ul{margin-left:.125em}
#toc ul.sectlevel0>li>a{font-style:italic}
#toc ul.sectlevel0 ul.sectlevel1{margin:.5em 0}
#toc ul{font-family:"Open Sans","DejaVu Sans",sans-serif;list-style-type:none}
#toc li{line-height:1.3334;margin-top:.3334em}
#toc a{text-decoration:none}
#toc a:active{text-decoration:underline}
#toctitle{color:#7a2518;font-size:1.2em}
@media screen and (min-width:768px){#toctitle{font-size:1.375em}
body.toc2{padding-left:15em;padding-right:0}
body.toc2 #header>h1:nth-last-child(2){border-bottom:1px solid #dddddf;padding-bottom:8px}
#toc.toc2{margin-top:0!important;background:#f8f8f7;position:fixed;width:15em;left:0;top:0;border-right:1px solid #e7e7e9;border-top-width:0!important;border-bottom-width:0!important;z-index:1000;padding:1.25em 1em;height:100%;overflow:auto}
#toc.toc2 #toctitle{margin-top:0;margin-bottom:.8rem;font-size:1.2em}
#toc.toc2>ul{font-size:.9em;margin-bottom:0}
#toc.toc2 ul ul{margin-left:0;padding-left:1em}
#toc.toc2 ul.sectlevel0 ul.sectlevel1{padding-left:0;margin-top:.5em;margin-bottom:.5em}
body.toc2.toc-right{padding-left:0;padding-right:15em}
body.toc2.toc-right #toc.toc2{border-right-width:0;border-left:1px solid #e7e7e9;left:auto;right:0}}
@media screen and (min-width:1280px){body.toc2{padding-left:20em;padding-right:0}
#toc.toc2{width:20em}
#toc.toc2 #toctitle{font-size:1.375em}
#toc.toc2>ul{font-size:.95em}
#toc.toc2 ul ul{padding-left:1.25em}
body.toc2.toc-right{padding-left:0;padding-right:20em}}
#content #toc{border:1px solid #e0e0dc;margin-bottom:1.25em;padding:1.25em;background:#f8f8f7;border-radius:4px}
#content #toc>:first-child{margin-top:0}
#content #toc>:last-child{margin-bottom:0}
#footer{max-width:none;background:rgba(0,0,0,.8);padding:1.25em}
#footer-text{color:hsla(0,0%,100%,.8);line-height:1.44}
#content{margin-bottom:.625em}
.sect1{padding-bottom:.625em}
@media screen and (min-width:768px){#content{margin-bottom:1.25em}
.sect1{padding-bottom:1.25em}}
.sect1:last-child{padding-bottom:0}
.sect1+.sect1{border-top:1px solid #e7e7e9}
#content h1>a.anchor,h2>a.anchor,h3>a.anchor,#toctitle>a.anchor,.sidebarblock>.content>.title>a.anchor,h4>a.anchor,h5>a.anchor,h6>a.anchor{position:absolute;z-index:1001;width:1.5ex;margin-left:-1.5ex;display:block;text-decoration:none!important;visibility:hidden;text-align:center;font-weight:400}
#content h1>a.anchor::before,h2>a.anchor::before,h3>a.anchor::before,#toctitle>a.anchor::before,.sidebarblock>.content>.title>a.anchor::before,h4>a.anchor::before,h5>a.anchor::before,h6>a.anchor::before{content:"\00A7";font-size:.85em;display:block;padding-top:.1em}
#content h1:hover>a.anchor,#content h1>a.anchor:hover,h2:hover>a.anchor,h2>a.anchor:hover,h3:hover>a.anchor,#toctitle:hover>a.anchor,.sidebarblock>.content>.title:hover>a.anchor,h3>a.anchor:hover,#toctitle>a.anchor:hover,.sidebarblock>.content>.title>a.anchor:hover,h4:hover>a.anchor,h4>a.anchor:hover,h5:hover>a.anchor,h5>a.anchor:hover,h6:hover>a.anchor,h6>a.anchor:hover{visibility:visible}
#content h1>a.link,h2>a.link,h3>a.link,#toctitle>a.link,.sidebarblock>.content>.title>a.link,h4>a.link,h5>a.link,h6>a.link{color:#ba3925;text-decoration:none}
#content h1>a.link:hover,h2>a.link:hover,h3>a.link:hover,#toctitle>a.link:hover,.sidebarblock>.content>.title>a.link:hover,h4>a.link:hover,h5>a.link:hover,h6>a.link:hover{color:#a53221}
details,.audioblock,.imageblock,.literalblock,.listingblock,.stemblock,.videoblock{margin-bottom:1.25em}
details{margin-left:1.25rem}
details>summary{cursor:pointer;display:block;position:relative;line-height:1.6;margin-bottom:.625rem;outline:none;-webkit-tap-highlight-color:transparent}
details>summary::-webkit-details-marker{display:none}
details>summary::before{content:"";border:solid transparent;border-left:solid;border-width:.3em 0 .3em .5em;position:absolute;top:.5em;left:-1.25rem;transform:translateX(15%)}
details[open]>summary::before{border:solid transparent;border-top:solid;border-width:.5em .3em 0;transform:translateY(15%)}
details>summary::after{content:"";width:1.25rem;height:1em;position:absolute;top:.3em;left:-1.25rem}
.admonitionblock td.content>.title,.audioblock>.title,.exampleblock>.title,.imageblock>.title,.listingblock>.title,.literalblock>.title,.stemblock>.title,.openblock>.title,.paragraph>.title,.quoteblock>.title,table.tableblock>.title,.verseblock>.title,.videoblock>.title,.dlist>.title,.olist>.title,.ulist>.title,.qlist>.title,.hdlist>.title{text-rendering:optimizeLegibility;text-align:left;font-family:"Noto Serif","DejaVu Serif",serif;font-size:1rem;font-style:italic}
table.tableblock.fit-content>caption.title{white-space:nowrap;width:0}
.paragraph.lead>p,#preamble>.sectionbody>[class=paragraph]:first-of-type p{font-size:1.21875em;line-height:1.6;color:rgba(0,0,0,.85)}
.admonitionblock>table{border-collapse:separate;border:0;background:none;width:100%}
.admonitionblock>table td.icon{text-align:center;width:80px}
.admonitionblock>table td.icon img{max-width:none}
.admonitionblock>table td.icon .title{font-weight:bold;font-family:"Open Sans","DejaVu Sans",sans-serif;text-transform:uppercase}
.admonitionblock>table td.content{padding-left:1.125em;padding-right:1.25em;border-left:1px solid #dddddf;color:rgba(0,0,0,.6);word-wrap:anywhere}
.admonitionblock>table td.content>:last-child>:last-child{margin-bottom:0}
.exampleblock>.content{border:1px solid #e6e6e6;margin-bottom:1.25em;padding:1.25em;background:#fff;border-radius:4px}
.sidebarblock{border:1px solid #dbdbd6;margin-bottom:1.25em;padding:1.25em;background:#f3f3f2;border-radius:4px}
.sidebarblock>.content>.title{color:#7a2518;margin-top:0;text-align:center}
.exampleblock>.content>:first-child,.sidebarblock>.content>:first-child{margin-top:0}
.exampleblock>.content>:last-child,.exampleblock>.content>:last-child>:last-child,.exampleblock>.content .olist>ol>li:last-child>:last-child,.exampleblock>.content .ulist>ul>li:last-child>:last-child,.exampleblock>.content .qlist>ol>li:last-child>:last-child,.sidebarblock>.content>:last-child,.sidebarblock>.content>:last-child>:last-child,.sidebarblock>.content .olist>ol>li:last-child>:last-child,.sidebarblock>.content .ulist>ul>li:last-child>:last-child,.sidebarblock>.content .qlist>ol>li:last-child>:last-child{margin-bottom:0}
.literalblock pre,.listingblock>.content>pre{border-radius:4px;overflow-x:auto;padding:1em;font-size:.8125em}
@media screen and (min-width:768px){.literalblock pre,.listingblock>.content>pre{font-size:.90625em}}
@media screen and (min-width:1280px){.literalblock pre,.listingblock>.content>pre{font-size:1em}}
.literalblock pre,.listingblock>.content>pre:not(.highlight),.listingblock>.content>pre[class=highlight],.listingblock>.content>pre[class^="highlight "]{background:#f7f7f8}
.literalblock.output pre{color:#f7f7f8;background:rgba(0,0,0,.9)}
.listingblock>.content{position:relative}
.listingblock pre>code{display:block}
.listingblock code[data-lang]::before{display:none;content:attr(data-lang);position:absolute;font-size:.75em;top:.425rem;right:.5rem;line-height:1;text-transform:uppercase;color:inherit;opacity:.5}
.listingblock:hover code[data-lang]::before{display:block}
.listingblock.terminal pre .command::before{content:attr(data-prompt);padding-right:.5em;color:inherit;opacity:.5}
.listingblock.terminal pre .command:not([data-prompt])::before{content:"$"}
.listingblock pre.highlightjs{padding:0}
.listingblock pre.highlightjs>code{padding:1em;border-radius:4px}
.listingblock pre.prettyprint{border-width:0}
.prettyprint{background:#f7f7f8}
pre.prettyprint .linenums{line-height:1.45;margin-left:2em}
pre.prettyprint li{background:none;list-style-type:inherit;padding-left:0}
pre.prettyprint li code[data-lang]::before{opacity:1}
pre.prettyprint li:not(:first-child) code[data-lang]::before{display:none}
table.linenotable{border-collapse:separate;border:0;margin-bottom:0;background:none}
table.linenotable td[class]{color:inherit;vertical-align:top;padding:0;line-height:inherit;white-space:normal}
table.linenotable td.code{padding-left:.75em}
table.linenotable td.linenos,pre.pygments .linenos{border-right:1px solid;opacity:.35;padding-right:.5em;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}
pre.pygments span.linenos{display:inline-block;margin-right:.75em}
.quoteblock{margin:0 1em 1.25em 1.5em;display:table}
.quoteblock:not(.excerpt)>.title{margin-left:-1.5em;margin-bottom:.75em}
.quoteblock blockquote,.quoteblock p{color:rgba(0,0,0,.85);font-size:1.15rem;line-height:1.75;word-spacing:.1em;letter-spacing:0;font-style:italic;text-align:justify}
.quoteblock blockquote{margin:0;padding:0;border:0}
.quoteblock blockquote::before{content:"\201c";float:left;font-size:2.75em;font-weight:bold;line-height:.6em;margin-left:-.6em;color:#7a2518;text-shadow:0 1px 2px rgba(0,0,0,.1)}
.quoteblock blockquote>.paragraph:last-child p{margin-bottom:0}
.quoteblock .attribution{margin-top:.75em;margin-right:.5ex;text-align:right}
.verseblock{margin:0 1em 1.25em}
.verseblock pre{font-family:"Open Sans","DejaVu Sans",sans-serif;font-size:1.15rem;color:rgba(0,0,0,.85);font-weight:300;text-rendering:optimizeLegibility}
.verseblock pre strong{font-weight:400}
.verseblock .attribution{margin-top:1.25rem;margin-left:.5ex}
.quoteblock .attribution,.verseblock .attribution{font-size:.9375em;line-height:1.45;font-style:italic}
.quoteblock .attribution br,.verseblock .attribution br{display:none}
.quoteblock .attribution cite,.verseblock .attribution cite{display:block;letter-spacing:-.025em;color:rgba(0,0,0,.6)}
.quoteblock.abstract blockquote::before,.quoteblock.excerpt blockquote::before,.quoteblock .quoteblock blockquote::before{display:none}
.quoteblock.abstract blockquote,.quoteblock.abstract p,.quoteblock.excerpt blockquote,.quoteblock.excerpt p,.quoteblock .quoteblock blockquote,.quoteblock .quoteblock p{line-height:1.6;word-spacing:0}
.quoteblock.abstract{margin:0 1em 1.25em;display:block}
.quoteblock.abstract>.title{margin:0 0 .375em;font-size:1.15em;text-align:center}
.quoteblock.excerpt>blockquote,.quoteblock .quoteblock{padding:0 0 .25em 1em;border-left:.25em solid #dddddf}
.quoteblock.excerpt,.quoteblock .quoteblock{margin-left:0}
.quoteblock.excerpt blockquote,.quoteblock.excerpt p,.quoteblock .quoteblock blockquote,.quoteblock .quoteblock p{color:inherit;font-size:1.0625rem}
.quoteblock.excerpt .attribution,.quoteblock .quoteblock .attribution{color:inherit;font-size:.85rem;text-align:left;margin-right:0}
p.tableblock:last-child{margin-bottom:0}
td.tableblock>.content{margin-bottom:1.25em;word-wrap:anywhere}
td.tableblock>.content>:last-child{margin-bottom:-1.25em}
table.tableblock,th.tableblock,td.tableblock{border:0 solid #dedede}
table.grid-all>*>tr>*{border-width:1px}
table.grid-cols>*>tr>*{border-width:0 1px}
table.grid-rows>*>tr>*{border-width:1px 0}
table.frame-all{border-width:1px}
table.frame-ends{border-width:1px 0}
table.frame-sides{border-width:0 1px}
table.frame-none>colgroup+*>:first-child>*,table.frame-sides>colgroup+*>:first-child>*{border-top-width:0}
table.frame-none>:last-child>:last-child>*,table.frame-sides>:last-child>:last-child>*{border-bottom-width:0}
table.frame-none>*>tr>:first-child,table.frame-ends>*>tr>:first-child{border-left-width:0}
table.frame-none>*>tr>:last-child,table.frame-ends>*>tr>:last-child{border-right-width:0}
table.stripes-all>*>tr,table.stripes-odd>*>tr:nth-of-type(odd),table.stripes-even>*>tr:nth-of-type(even),table.stripes-hover>*>tr:hover{background:#f8f8f7}
th.halign-left,td.halign-left{text-align:left}
th.halign-right,td.halign-right{text-align:right}
th.halign-center,td.halign-center{text-align:center}
th.valign-top,td.valign-top{vertical-align:top}
th.valign-bottom,td.valign-bottom{vertical-align:bottom}
th.valign-middle,td.valign-middle{vertical-align:middle}
table thead th,table tfoot th{font-weight:bold}
tbody tr th{background:#f7f8f7}
tbody tr th,tbody tr th p,tfoot tr th,tfoot tr th p{color:rgba(0,0,0,.8);font-weight:bold}
p.tableblock>code:only-child{background:none;padding:0}
p.tableblock{font-size:1em}
ol{margin-left:1.75em}
ul li ol{margin-left:1.5em}
dl dd{margin-left:1.125em}
dl dd:last-child,dl dd:last-child>:last-child{margin-bottom:0}
li p,ul dd,ol dd,.olist .olist,.ulist .ulist,.ulist .olist,.olist .ulist{margin-bottom:.625em}
ul.checklist,ul.none,ol.none,ul.no-bullet,ol.no-bullet,ol.unnumbered,ul.unstyled,ol.unstyled{list-style-type:none}
ul.no-bullet,ol.no-bullet,ol.unnumbered{margin-left:.625em}
ul.unstyled,ol.unstyled{margin-left:0}
li>p:empty:only-child::before{content:"";display:inline-block}
ul.checklist>li>p:first-child{margin-left:-1em}
ul.checklist>li>p:first-child>.fa-square-o:first-child,ul.checklist>li>p:first-child>.fa-check-square-o:first-child{width:1.25em;font-size:.8em;position:relative;bottom:.125em}
ul.checklist>li>p:first-child>input[type=checkbox]:first-child{margin-right:.25em}
ul.inline{display:flex;flex-flow:row wrap;list-style:none;margin:0 0 .625em -1.25em}
ul.inline>li{margin-left:1.25em}
.unstyled dl dt{font-weight:400;font-style:normal}
ol.arabic{list-style-type:decimal}
ol.decimal{list-style-type:decimal-leading-zero}
ol.loweralpha{list-style-type:lower-alpha}
ol.upperalpha{list-style-type:upper-alpha}
ol.lowerroman{list-style-type:lower-roman}
ol.upperroman{list-style-type:upper-roman}
ol.lowergreek{list-style-type:lower-greek}
.hdlist>table,.colist>table{border:0;background:none}
.hdlist>table>tbody>tr,.colist>table>tbody>tr{background:none}
td.hdlist1,td.hdlist2{vertical-align:top;padding:0 .625em}
td.hdlist1{font-weight:bold;padding-bottom:1.25em}
td.hdlist2{word-wrap:anywhere}
.literalblock+.colist,.listingblock+.colist{margin-top:-.5em}
.colist td:not([class]):first-child{padding:.4em .75em 0;line-height:1;vertical-align:top}
.colist td:not([class]):first-child img{max-width:none}
.colist td:not([class]):last-child{padding:.25em 0}
.thumb,.th{line-height:0;display:inline-block;border:4px solid #fff;box-shadow:0 0 0 1px #ddd}
.imageblock.left{margin:.25em .625em 1.25em 0}
.imageblock.right{margin:.25em 0 1.25em .625em}
.imageblock>.title{margin-bottom:0}
.imageblock.thumb,.imageblock.th{border-width:6px}
.imageblock.thumb>.title,.imageblock.th>.title{padding:0 .125em}
.image.left,.image.right{margin-top:.25em;margin-bottom:.25em;display:inline-block;line-height:0}
.image.left{margin-right:.625em}
.image.right{margin-left:.625em}
a.image{text-decoration:none;display:inline-block}
a.image object{pointer-events:none}
sup.footnote,sup.footnoteref{font-size:.875em;position:static;vertical-align:super}
sup.footnote a,sup.footnoteref a{text-decoration:none}
sup.footnote a:active,sup.footnoteref a:active,#footnotes .footnote a:first-of-type:active{text-decoration:underline}
#footnotes{padding-top:.75em;padding-bottom:.75em;margin-bottom:.625em}
#footnotes hr{width:20%;min-width:6.25em;margin:-.25em 0 .75em;border-width:1px 0 0}
#footnotes .footnote{padding:0 .375em 0 .225em;line-height:1.3334;font-size:.875em;margin-left:1.2em;margin-bottom:.2em}
#footnotes .footnote a:first-of-type{font-weight:bold;text-decoration:none;margin-left:-1.05em}
#footnotes .footnote:last-of-type{margin-bottom:0}
#content #footnotes{margin-top:-.625em;margin-bottom:0;padding:.75em 0}
div.unbreakable{page-break-inside:avoid}
.big{font-size:larger}
.small{font-size:smaller}
.underline{text-decoration:underline}
.overline{text-decoration:overline}
.line-through{text-decoration:line-through}
.aqua{color:#00bfbf}
.aqua-background{background:#00fafa}
.black{color:#000}
.black-background{background:#000}
.blue{color:#0000bf}
.blue-background{background:#0000fa}
.fuchsia{color:#bf00bf}
.fuchsia-background{background:#fa00fa}
.gray{color:#606060}
.gray-background{background:#7d7d7d}
.green{color:#006000}
.green-background{background:#007d00}
.lime{color:#00bf00}
.lime-background{background:#00fa00}
.maroon{color:#600000}
.maroon-background{background:#7d0000}
.navy{color:#000060}
.navy-background{background:#00007d}
.olive{color:#606000}
.olive-background{background:#7d7d00}
.purple{color:#600060}
.purple-background{background:#7d007d}
.red{color:#bf0000}
.red-background{background:#fa0000}
.silver{color:#909090}
.silver-background{background:#bcbcbc}
.teal{color:#006060}
.teal-background{background:#007d7d}
.white{color:#bfbfbf}
.white-background{background:#fafafa}
.yellow{color:#bfbf00}
.yellow-background{background:#fafa00}
span.icon>.fa{cursor:default}
a span.icon>.fa{cursor:inherit}
.admonitionblock td.icon [class^="fa icon-"]{font-size:2.5em;text-shadow:1px 1px 2px rgba(0,0,0,.5);cursor:default}
.admonitionblock td.icon .icon-note::before{content:"\f05a";color:#19407c}
.admonitionblock td.icon .icon-tip::before{content:"\f0eb";text-shadow:1px 1px 2px rgba(155,155,0,.8);color:#111}
.admonitionblock td.icon .icon-warning::before{content:"\f071";color:#bf6900}
.admonitionblock td.icon .icon-caution::before{content:"\f06d";color:#bf3400}
.admonitionblock td.icon .icon-important::before{content:"\f06a";color:#bf0000}
.conum[data-value]{display:inline-block;color:#fff!important;background:rgba(0,0,0,.8);border-radius:50%;text-align:center;font-size:.75em;width:1.67em;height:1.67em;line-height:1.67em;font-family:"Open Sans","DejaVu Sans",sans-serif;font-style:normal;font-weight:bold}
.conum[data-value] *{color:#fff!important}
.conum[data-value]+b{display:none}
.conum[data-value]::after{content:attr(data-value)}
pre .conum[data-value]{position:relative;top:-.125em}
b.conum *{color:inherit!important}
.conum:not([data-value]):empty{display:none}
dt,th.tableblock,td.content,div.footnote{text-rendering:optimizeLegibility}
h1,h2,p,td.content,span.alt,summary{letter-spacing:-.01em}
p strong,td.content strong,div.footnote strong{letter-spacing:-.005em}
p,blockquote,dt,td.content,td.hdlist1,span.alt,summary{font-size:1.0625rem}
p{margin-bottom:1.25rem}
.sidebarblock p,.sidebarblock dt,.sidebarblock td.content,p.tableblock{font-size:1em}
.exampleblock>.content{background:#fffef7;border-color:#e0e0dc;box-shadow:0 1px 4px #e0e0dc}
.print-only{display:none!important}
@page{margin:1.25cm .75cm}
@media print{*{box-shadow:none!important;text-shadow:none!important}
html{font-size:80%}
a{color:inherit!important;text-decoration:underline!important}
a.bare,a[href^="#"],a[href^="mailto:"]{text-decoration:none!important}
a[href^="http:"]:not(.bare)::after,a[href^="https:"]:not(.bare)::after{content:"(" attr(href) ")";display:inline-block;font-size:.875em;padding-left:.25em}
abbr[title]{border-bottom:1px dotted}
abbr[title]::after{content:" (" attr(title) ")"}
pre,blockquote,tr,img,object,svg{page-break-inside:avoid}
thead{display:table-header-group}
svg{max-width:100%}
p,blockquote,dt,td.content{font-size:1em;orphans:3;widows:3}
h2,h3,#toctitle,.sidebarblock>.content>.title{page-break-after:avoid}
#header,#content,#footnotes,#footer{max-width:none}
#toc,.sidebarblock,.exampleblock>.content{background:none!important}
#toc{border-bottom:1px solid #dddddf!important;padding-bottom:0!important}
body.book #header{text-align:center}
body.book #header>h1:first-child{border:0!important;margin:2.5em 0 1em}
body.book #header .details{border:0!important;display:block;padding:0!important}
body.book #header .details span:first-child{margin-left:0!important}
body.book #header .details br{display:block}
body.book #header .details br+span::before{content:none!important}
body.book #toc{border:0!important;text-align:left!important;padding:0!important;margin:0!important}
body.book #toc,body.book #preamble,body.book h1.sect0,body.book .sect1>h2{page-break-before:always}
.listingblock code[data-lang]::before{display:block}
#footer{padding:0 .9375em}
.hide-on-print{display:none!important}
.print-only{display:block!important}
.hide-for-print{display:none!important}
.show-for-print{display:inherit!important}}
@media amzn-kf8,print{#header>h1:first-child{margin-top:1.25rem}
.sect1{padding:0!important}
.sect1+.sect1{border:0}
#footer{background:none}
#footer-text{color:rgba(0,0,0,.6);font-size:.9em}}
@media amzn-kf8{#header,#content,#footnotes,#footer{padding:0}}
</style>
</head>
<body class="article toc2 toc-left">
<div id="header">
<h1>Basic DataTemplate Sample</h1>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_before_we_start">Before we start</a>
<ul class="sectlevel2">
<li><a href="#_datatemplates">DataTemplates</a></li>
<li><a href="#_tostring">ToString</a></li>
<li><a href="#_string_format">String format</a></li>
</ul>
</li>
<li><a href="#_approach_1_override_tostring">Approach 1 : Override ToString</a>
<ul class="sectlevel2">
<li><a href="#_step_1_create_a_new_project">Step 1: Create a new Project</a></li>
<li><a href="#_step_2_add_the_models">Step 2: Add the Models</a></li>
<li><a href="#_step_3_add_a_list_of_students_and_teachers">Step 3: Add a list of Students and Teachers</a></li>
<li><a href="#_step_4_setup_the_view">Step 4: Setup the View</a></li>
<li><a href="#_step_5_run_the_app">Step 5: Run the App</a></li>
<li><a href="#_step_6_override_tostring">Step 6: Override ToString</a></li>
<li><a href="#_step_7_run_the_app_again">Step 7: Run the App again</a></li>
</ul>
</li>
<li><a href="#_approach_2_create_a_custom_datatemplate">Approach 2 : Create a custom DataTemplate</a>
<ul class="sectlevel2">
<li><a href="#_step_1_create_a_datatemplate_for_person">Step 1: Create a DataTemplate for "Person"</a></li>
<li><a href="#_step_2_run_the_app">Step 2: Run the App</a></li>
<li><a href="#MoreSpecificDataTemplates">Step 3: Create more specific DataTemplates</a></li>
<li><a href="#_step_4_run_it_again">Step 4: Run it again</a></li>
</ul>
</li>
<li><a href="#_approach_3_place_a_usercontrol_inside_a_datatemplate">Approach 3 : Place a UserControl inside a DataTemplate</a>
<ul class="sectlevel2">
<li><a href="#_step_1_add_a_new_usercontrol">Step 1: Add a new UserControl</a></li>
<li><a href="#_step_2_add_the_usercontrol_to_your_datatemplate">Step 2: Add the UserControl to your DataTemplate</a></li>
<li><a href="#_step_4_run_it_once_again">Step 4: Run it once again</a></li>
</ul>
</li>
<li><a href="#_related">Related</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>This example will show you how you can use <code>DataTemplates</code> to control how your data is displayed. You will learn how to use different <code>DataTemplates</code> for different <code>classes</code>, how to re-use existing <code>DataTemplates</code> and how to define complex <code>DataTemplates</code> using <code>UserControls</code>.</p>
</div>
<!-- toc disabled -->
<h3 id="_difficulty" class="discrete">Difficulty</h3>
<div class="paragraph">
<p>🐔 Normal 🐔</p>
</div>
<h3 id="_buzz_words" class="discrete">Buzz-Words</h3>
<div class="paragraph">
<p>DataTemplate, ToString, StringFormat, MVVM, ItemTemplate, ContentTemplate</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_before_we_start">Before we start</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You should have a basic knowledge about string format in <code>C#</code> and about the <code>MVVM</code>-pattern.</p>
</div>
<div class="sect2">
<h3 id="_datatemplates">DataTemplates</h3>
<div class="paragraph">
<p>In Avalonia you can use <a href="https://docs.avaloniaui.net/docs/basics/data/data-templates">[<code>DataTemplates</code>]</a> to control how your data is shown. You can define the <code>DataType</code> which the <code>DataTemplate</code> is made for. The <code>DataType</code> can be any <code>class</code> or <code>interface</code>.</p>
</div>
</div>
<div class="sect2">
<h3 id="_tostring">ToString</h3>
<div class="paragraph">
<p>If no <code>DataTemplate</code> is found that matches your <code>object</code>, Avalonia will call <code>ToString()</code> and display the result in a <code>TextBlock</code>. You can <a href="https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/how-to-override-the-tostring-method">[override <code>ToString()</code>]</a> in your own <code>class</code>, if you want to return a custom string.</p>
</div>
</div>
<div class="sect2">
<h3 id="_string_format">String format</h3>
<div class="paragraph">
<p>If you want to learn more about possible string formats, you can find look these up in the Microsoft docs. Below you can find a list of common string formats:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://learn.microsoft.com/en-us/dotnet/api/system.string.format?view=net-6.0">General</a></p>
</li>
<li>
<p><a href="https://learn.microsoft.com/en-us/dotnet/standard/base-types/formatting-types">Formatting Types in .NET</a></p>
</li>
<li>
<p><a href="https://learn.microsoft.com/en-us/dotnet/standard/base-types/composite-formatting">Composite Formatting</a></p>
</li>
<li>
<p><a href="https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-date-and-time-format-strings">Standard Date and Time Format Strings</a></p>
</li>
<li>
<p><a href="https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings">Custom Date and Time Format Strings</a></p>
</li>
<li>
<p><a href="https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-numeric-format-strings">Standard Numeric Format Strings</a></p>
</li>
<li>
<p><a href="https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-numeric-format-strings">Custom Numeric Format Strings</a></p>
</li>
<li>
<p><a href="https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-timespan-format-strings">Standard TimeSpan Format Strings</a></p>
</li>
<li>
<p><a href="https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-timespan-format-strings">Custom TimeSpan Format Strings</a></p>
</li>
<li>
<p><a href="https://learn.microsoft.com/en-us/dotnet/standard/base-types/enumeration-format-strings">Enumeration Format Strings</a></p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_approach_1_override_tostring">Approach 1 : Override ToString</h2>
<div class="sectionbody">
<div class="paragraph">
<p>In this sample we want to create a list of people in a school. This can be a student, a teacher or any other person.</p>
</div>
<div class="sect2">
<h3 id="_step_1_create_a_new_project">Step 1: Create a new Project</h3>
<div class="paragraph">
<p>Create a new Project using the <code>Avalonia MVVM Application</code>-Template.</p>
</div>
</div>
<div class="sect2">
<h3 id="_step_2_add_the_models">Step 2: Add the Models</h3>
<div class="paragraph">
<p>In a school there are students and teachers. They have in common, that they are persons having a fist name, a last name, an age and a sex. Sex is an <code>enum</code> which we have to define at first, so add a new file <code>Sex.cs</code> into your <code>Models</code> folder:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-cs" data-lang="cs">namespace BasicDataTemplateSample.Models
{
    // Feel free to add or reorder the entries based on your needs.
    public enum Sex
    {
        Diverse,
        Female,
        Male
    }
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>We can now add a <code>class</code> called <code>Person.cs</code> into the <code>Models</code> folder, which will be our base class for <code>Student</code> and <code>Teacher</code>. In this sample the <code>Properties</code> will be <code>init</code>-only, which means they can only be set once when the <code>object</code> is created. If you want, you can extend it from <code>ReactiveObject</code>, so you will be able to change the name, age or sex later.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-cs" data-lang="cs">namespace BasicDataTemplateSample.Models
{
    public class Person
    {
        /// &lt;summary&gt;
        /// Gets or sets the first name of the person. You can only set this property on init.
        /// &lt;/summary&gt;
        public string? FirstName { get; init; }

        /// &lt;summary&gt;
        /// Gets or sets the last name of the person. You can only set this property on init.
        /// &lt;/summary&gt;
        public string? LastName { get; init; }

        /// &lt;summary&gt;
        /// Gets or sets the age of the person. You can only set this property on init.
        /// &lt;/summary&gt;
        public int Age { get; init; }

        /// &lt;summary&gt;
        /// Gets or sets the sex of the person. You can only set this property on init.
        /// &lt;/summary&gt;
        public Sex Sex { get; init; }
    }
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Now add <code>Student.cs</code>, which will be based on <code>Person</code>, but has an additional property called <code>Grade</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-cs" data-lang="cs">namespace BasicDataTemplateSample.Models
{
    public class Student : Person
    {
        /// &lt;summary&gt;
        /// Gets or sets the grade of the student. You can only set this property on init.
        /// &lt;/summary&gt;
        public int Grade { get; init; }
    }
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Last but not least add <code>Teacher.cs</code>, which will also be based on <code>Person</code>, but has an additional property called <code>Subject</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-cs" data-lang="cs">namespace BasicDataTemplateSample.Models
{
    public class Teacher : Person
    {
        /// &lt;summary&gt;
        /// Gets or sets the subject that the teacher is teaching. You can only set this property on init.
        /// &lt;/summary&gt;
        public string? Subject { get; init; }
    }
}</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_step_3_add_a_list_of_students_and_teachers">Step 3: Add a list of Students and Teachers</h3>
<div class="paragraph">
<p>In the file <code>ViewModels ► MainWindowViewModel.cs</code> add a <code>List</code> of type <code>Person</code> called <code>People</code> and add one <code>Teacher</code> and two <code>Students</code> to the list:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-cs" data-lang="cs">namespace BasicDataTemplateSample.ViewModels
{
    public class MainWindowViewModel : ViewModelBase
    {
        /// &lt;summary&gt;
        /// As this is a list of Persons, we can add Students and Teachers here.
        /// &lt;/summary&gt;
        public List&lt;Person&gt; People { get; } = new List&lt;Person&gt;()
        {
            new Teacher
            {
                FirstName = "Mr.",
                LastName = "X",
                Age = 55,
                Sex=Sex.Diverse,
                Subject = "My Favorite Subject"
            },
            new Student
            {
                FirstName = "Hello",
                LastName = "World",
                Age = 17,
                Sex= Sex.Male,
                Grade=12
            },
            new Student
            {
                FirstName = "Hello",
                LastName = "Kitty",
                Age = 12,
                Sex= Sex.Female,
                Grade=6
            }
        };
    }
}</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_step_4_setup_the_view">Step 4: Setup the View</h3>
<div class="paragraph">
<p>In the file <code>Views ► MainWindow.axaml</code> add a <code>ListBox</code> and bind <code>ItemsSource</code> to <code>People</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;Window x:Class="BasicDataTemplateSample.Views.MainWindow"
        xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:vm="using:BasicDataTemplateSample.ViewModels"
        Title="BasicDataTemplateSample"
        Height="350"
		Width="350"
        x:CompileBindings="true"
        x:DataType="vm:MainWindowViewModel"
        Icon="/Assets/avalonia-logo.ico"
        mc:Ignorable="d"&gt;

    &lt;Design.DataContext&gt;
        &lt;vm:MainWindowViewModel /&gt;
    &lt;/Design.DataContext&gt;

    &lt;ListBox ItemsSource="{Binding People}" /&gt;

&lt;/Window&gt;</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_step_5_run_the_app">Step 5: Run the App</h3>
<div class="paragraph">
<p>Now hit <code>[Run]</code> or <code>[Debug]</code> in your IDE and see the result:</p>
</div>
<div class="imageblock">
<div class="content">
<img src="_docs/Image_01.png" alt="Preview of the App">
</div>
</div>
<div class="paragraph">
<p>You can see that all three persons are there, but the information is not really useful for us. In the next step we will fix this.</p>
</div>
</div>
<div class="sect2">
<h3 id="_step_6_override_tostring">Step 6: Override ToString</h3>
<div class="paragraph">
<p>In the class <code>Person</code> we will override <code>ToString()</code>. You can do the same for <code>Teacher</code> and <code>Student</code> if you want to. Just add the following lines:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-cs" data-lang="cs">public override string ToString()
{
    return $"{FirstName} {LastName} (Age: {Age}, Sex: {Sex})";
}</code></pre>
</div>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
We are using string interpolation to format the string. See the <a href="https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/interpolated">[Microsoft Docs]</a> for more info.
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_step_7_run_the_app_again">Step 7: Run the App again</h3>
<div class="paragraph">
<p>Run the App again and see the result, which is now much more useful:</p>
</div>
<div class="imageblock">
<div class="content">
<img src="_docs/Image_02.png" alt="Preview of the App">
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_approach_2_create_a_custom_datatemplate">Approach 2 : Create a custom DataTemplate</h2>
<div class="sectionbody">
<div class="paragraph">
<p>If the result that <code>ToString</code> delivers is not enough for your use case, you can provide your own <code>DataTemplate</code> for each <code>DataType</code> you have. In Avalonia you have several options to store a <code>DataTemplate</code>. It is most common to store them inside <code>DataTemplates</code>-section or in the <code>Resources</code>-section. A <code>DataTemplate</code> inside <code>DataTemplates</code> will be applied automatically if it matches, whereas a <code>DataTemplate</code> inside <code>Resources</code> needs to be applied explicitly. We will see how that can be done in this chapter.</p>
</div>
<div class="sect2">
<h3 id="_step_1_create_a_datatemplate_for_person">Step 1: Create a DataTemplate for "Person"</h3>
<div class="paragraph">
<p>In <code>Window.DataTemplates</code> we will add the following <code>DataTemplate</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;!-- remember to add the needed namespace model --&gt;
&lt;!-- xmlns:model="using:BasicDataTemplateSample.Models" --&gt;
&lt;Window.DataTemplates&gt;
    &lt;!--  Add a DataTemplate for any Person  --&gt;
    &lt;DataTemplate DataType="model:Person"&gt;
        &lt;Grid ColumnDefinitions="Auto, *" RowDefinitions="Auto, Auto, Auto, Auto"&gt;
            &lt;TextBlock Grid.Row="0" Text="First Name: " /&gt;
            &lt;TextBlock Grid.Row="0"
                       Grid.Column="1"
                       Text="{Binding FirstName}" /&gt;

            &lt;TextBlock Grid.Row="1" Text="Last Name: " /&gt;
            &lt;TextBlock Grid.Row="1"
                       Grid.Column="1"
                       Text="{Binding LastName}" /&gt;

            &lt;TextBlock Grid.Row="2" Text="Age: " /&gt;
            &lt;TextBlock Grid.Row="2"
                       Grid.Column="1"
                       Text="{Binding Age, StringFormat={}{0} years}" /&gt;

            &lt;TextBlock Grid.Row="3" Text="Sex: " /&gt;
            &lt;TextBlock Grid.Row="3"
                       Grid.Column="1"
                       Text="{Binding Sex}" /&gt;
        &lt;/Grid&gt;
    &lt;/DataTemplate&gt;
&lt;/Window.DataTemplates&gt;</code></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
Also if we use <code>Window.DataTemplates</code> in this sample, it can also be <code>App.DataTemplates</code> or inside any other control.
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_step_2_run_the_app">Step 2: Run the App</h3>
<div class="paragraph">
<p>We now have a much better visual representation of all people:</p>
</div>
<div class="imageblock">
<div class="content">
<img src="_docs/Image_03.png" alt="Image 03">
</div>
</div>
</div>
<div class="sect2">
<h3 id="MoreSpecificDataTemplates">Step 3: Create more specific DataTemplates</h3>
<div class="paragraph">
<p>But wait, <code>Student</code> and <code>Teacher</code> look exactly the same. Moreover the additional information we have about them is not visible. Let&#8217;s see how we can improve this.</p>
</div>
<div class="paragraph">
<p>We want to reuse the common <code>DataTemplate</code> for <code>Name</code>, <code>Age</code> and <code>Sex</code>. If we add more specific <code>DataTemplates</code>, only the first matching <code>DataTemplate</code> will be applied. So we will move the <code>DataTemplate</code> into <code>Window.Resources</code>. That way we can call it explicitly:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;Window.Resources&gt;
    &lt;!--  Add a DataTemplate for any Person  --&gt;
    &lt;!--  We add this to the Resources section, so we can access it via it's Key explicitly.  --&gt;
    &lt;DataTemplate x:Key="My.DataTemplates.Person" DataType="model:Person"&gt;
        &lt;Grid ColumnDefinitions="Auto, *" RowDefinitions="Auto, Auto, Auto, Auto"&gt;
            &lt;TextBlock Grid.Row="0" Text="First Name: " /&gt;
            &lt;TextBlock Grid.Row="0"
                       Grid.Column="1"
                       Text="{Binding FirstName}" /&gt;

            &lt;TextBlock Grid.Row="1" Text="Last Name: " /&gt;
            &lt;TextBlock Grid.Row="1"
                       Grid.Column="1"
                       Text="{Binding LastName}" /&gt;

            &lt;TextBlock Grid.Row="2" Text="Age: " /&gt;
            &lt;TextBlock Grid.Row="2"
                       Grid.Column="1"
                       Text="{Binding Age, StringFormat={}{0} years}" /&gt;

            &lt;TextBlock Grid.Row="3" Text="Sex: " /&gt;
            &lt;TextBlock Grid.Row="3"
                       Grid.Column="1"
                       Text="{Binding Sex}" /&gt;
        &lt;/Grid&gt;
    &lt;/DataTemplate&gt;
&lt;/Window.Resources&gt;</code></pre>
</div>
</div>
<div class="paragraph">
<p>Now we can add the more specific <code>DataTemplates</code> for <code>Student</code> and <code>Teacher</code>. As you can see we will use a <code>ContentControl</code> where we will set <code>ContentTemplate</code> to our <code>DataTemplate</code> we have in <code>Resources</code>.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;Window.DataTemplates&gt;
    &lt;!--  Add a DataTemplate for a Student  --&gt;
    &lt;!--  Mind the order of the Templates. Begin with the most specific first.  --&gt;
    &lt;DataTemplate DataType="model:Student"&gt;
        &lt;StackPanel&gt;
            &lt;TextBlock FontWeight="Bold" Text="{Binding Grade, StringFormat='I am a student in {0}. grade'}" /&gt;
            &lt;!--  We re-use the PersonTemplate here by using DynamicResource  --&gt;
            &lt;ContentControl Content="{Binding}" ContentTemplate="{DynamicResource My.DataTemplates.Person}" /&gt;
        &lt;/StackPanel&gt;
    &lt;/DataTemplate&gt;

    &lt;!--  Add a DataTemplate for a Teacher  --&gt;
    &lt;DataTemplate DataType="model:Teacher"&gt;
        &lt;StackPanel&gt;
            &lt;TextBlock FontWeight="Bold" Text="{Binding Subject, StringFormat='I am a teacher for: &amp;quot;{0}&amp;quot;'}" /&gt;
            &lt;!--  We use a UserControl here to display the data  --&gt;
            &lt;ContentControl Content="{Binding}" ContentTemplate="{DynamicResource My.DataTemplates.Person}" /&gt;
        &lt;/StackPanel&gt;
    &lt;/DataTemplate&gt;
&lt;/Window.DataTemplates&gt;</code></pre>
</div>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
We use <code>StringFormat</code> in the <code>Bindings</code>. if you want to know more about it, read more about it in the <a href="https://docs.avaloniaui.net/docs/data-binding/bindings#binding-stringformat">[docs]</a>
</td>
</tr>
</table>
</div>
<div class="admonitionblock warning">
<table>
<tr>
<td class="icon">
<i class="fa icon-warning" title="Warning"></i>
</td>
<td class="content">
The order of DataTemplates can be important. You need to order them form most-specific to least-specific (e.g. <code>Poodle &#8594; Dog &#8594; Animal</code> not <code>Animal &#8594; Dog &#8594; Poodle</code>). <a href="https://docs.avaloniaui.net/docs/templates/data-templates#evaluation-order">[more in the docs]</a>
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_step_4_run_it_again">Step 4: Run it again</h3>
<div class="paragraph">
<p>Now our App displays the data as we want it to do:</p>
</div>
<div class="imageblock">
<div class="content">
<img src="_docs/Image_04.png" alt="Image 04">
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_approach_3_place_a_usercontrol_inside_a_datatemplate">Approach 3 : Place a UserControl inside a DataTemplate</h2>
<div class="sectionbody">
<div class="paragraph">
<p>If you don&#8217;t want to use <code>Resources</code> for the reused parts, you can also create a <a href="https://docs.avaloniaui.net/docs/controls/usercontrol">[<code>UserControl</code>]</a> for it.</p>
</div>
<div class="sect2">
<h3 id="_step_1_add_a_new_usercontrol">Step 1: Add a new UserControl</h3>
<div class="paragraph">
<p>Add a new <code>UserControl</code> into the <code>Views</code>-folder called &#8220;PersonView&#8221;. In the <code>XAML</code> add the content you like to. It&#8217;s very similar to how it works in a <code>Window</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;UserControl x:Class="BasicDataTemplateSample.Views.PersonView"
             xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:model="using:BasicDataTemplateSample.Models" xmlns:vm="using:BasicDataTemplateSample.ViewModels"
             d:DesignHeight="450" d:DesignWidth="800"
             x:CompileBindings="True" x:DataType="model:Person"
             mc:Ignorable="d"&gt;
    &lt;Grid ColumnDefinitions="Auto, *" RowDefinitions="Auto, Auto, Auto, Auto"&gt;
        &lt;TextBlock Grid.Row="0" Text="First Name: " /&gt;
        &lt;TextBlock Grid.Row="0" Grid.Column="1"
                   Text="{Binding FirstName}" /&gt;

        &lt;TextBlock Grid.Row="1" Text="Last Name: " /&gt;
        &lt;TextBlock Grid.Row="1" Grid.Column="1"
                   Text="{Binding LastName}" /&gt;

        &lt;TextBlock Grid.Row="2" Text="Age: " /&gt;
        &lt;TextBlock Grid.Row="2" Grid.Column="1"
                   Text="{Binding Age, StringFormat={}{0} years}" /&gt;

        &lt;TextBlock Grid.Row="3" Text="Sex: " /&gt;
        &lt;TextBlock Grid.Row="3" Grid.Column="1"
                   Text="{Binding Sex}" /&gt;
    &lt;/Grid&gt;
&lt;/UserControl&gt;</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_step_2_add_the_usercontrol_to_your_datatemplate">Step 2: Add the UserControl to your DataTemplate</h3>
<div class="paragraph">
<p>Let&#8217;s edit the <code>DataTemplates</code> we already added in <a href="#MoreSpecificDataTemplates">Approach 2, Step 3</a>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;!-- remember to add the needed namespace view --&gt;
&lt;!-- xmlns:view="using:BasicDataTemplateSample.Views" --&gt;
&lt;Window.DataTemplates&gt;
    &lt;!--  Add a DataTemplate for a Student  --&gt;
    &lt;!--  Mind the order of the Templates. Begin with the most specific first.  --&gt;
    &lt;DataTemplate DataType="model:Student"&gt;
        &lt;StackPanel&gt;
            &lt;TextBlock FontWeight="Bold" Text="{Binding Grade, StringFormat='I am a student in {0}. grade'}" /&gt;
            &lt;!--  We use a UserControl here to display the data  --&gt;
            &lt;!--  Note: The UserControl will inherit the DataContext, so we don't need to set it explicitly--&gt;
            &lt;view:PersonView /&gt;
        &lt;/StackPanel&gt;
    &lt;/DataTemplate&gt;

    &lt;!--  Add a DataTemplate for a Teacher  --&gt;
    &lt;DataTemplate DataType="model:Teacher"&gt;
        &lt;StackPanel&gt;
            &lt;TextBlock FontWeight="Bold" Text="{Binding Subject, StringFormat='I am a teacher for: &amp;quot;{0}&amp;quot;'}" /&gt;
            &lt;!--  We use a UserControl here to display the data  --&gt;
            &lt;!--  Note: The UserControl will inherit the DataContext, so we don't need to set it explicitly--&gt;
            &lt;view:PersonView /&gt;
        &lt;/StackPanel&gt;
    &lt;/DataTemplate&gt;
&lt;/Window.DataTemplates&gt;</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_step_4_run_it_once_again">Step 4: Run it once again</h3>
<div class="paragraph">
<p>As you can see, the result is the same as before:</p>
</div>
<div class="imageblock">
<div class="content">
<img src="_docs/Image_04.png" alt="Image 04">
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_related">Related</h2>
<div class="sectionbody">
<div class="paragraph">
<p>If you need more advanced <code>DataTemplates</code>, you can use <code>FuncDataTemplate</code> or implement <code>IDataTemplate</code> in your own class.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://docs.avaloniaui.net/docs/templates/creating-data-templates-in-code">Creating Data Templates in Code</a></p>
</li>
<li>
<p><a href="https://github.com/AvaloniaUI/Avalonia.Samples/tree/main/src/Avalonia.Samples/DataTemplates/IDataTemplateSample">Implementing IDataTemplate</a></p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2025-11-07 18:43:23 UTC
</div>
</div>
</body>
</html>